Improvement in apparatus for treating celluloid bases for artificial teeth



LQD. DOBBINS. Apparatus for Treating Celluloid Bases for Artificial sfiN 0. 222,678. ;:Efiajgnied Dec. 16, I879. .4 I 1\ I WITNESSES: IINVENTOR: ag fizfla. 77

WLM BY ATTORNEYS.

MPEYERS, PHDTO-LITHOGRAPMER WASHINGTON D C.

UNITED STATES PATENT LEMUEL D. DOBBINS, OF CAMDEN, NEW JERSEY.

IMPROVEMENT IN APPARATUS FOR TREATING CELLULOID BASES FOR ARTIFICIALTEETH.

Specification forming part of Letters Patent No. 222,678, dated December16, 1879; application filed October 11, 1879. I s 7 To all whom it mayconcern:

Be it known that I, LEMUEL DAVIS Don- BINs, of Camden, in the county ofCamden and State of New Jersey, have invented a new and ImprovedApparatus for Treating Celluloid Bases for Artificial Teeth, of whichthe following is a specification.

The invention consists in a top plate, from which the press and clampare suspended by means of screw-bolts, which plate rests on the upperedge of the cylindrical chamber.

It further consistsin an improved press and clamp, which are soarrangedthat the clamp can be readily removed from the press for cooling.

In the accompanying drawings, Figure 1 represents a verticalcross-sectional elevation of my improved apparatus on the line 00 av,Fig. 2. Fig. 2 is a top view of the'conical base with the cylindricalchamber. Fig. 3 is a plan view of the top plate of the cylindricalchamber. Fig. 4 is a plan view of the clamp, showing the upper part ofthe same removed. Fig. 5 is a View of the under side of the top plate ofthe clamp. Fig. 6 is a plan view of the clamp, showing the upper part inplace. Fig.- 7 is a view of the under side of the bottom plate of theclamp. Fig. 8 is a view of the two slots, D D, in the bottom E, fitsinto the opening in the base A, and as the top is wider than the bottomit will be supported in this base. A plate, F, provided with a slot, G,in

the center, and adjoining this slot with an upright plate, H, having asmall notch, h, in its upper edge, and with four apertures, f f f, forthe screw-bolts, rests upon the upper edge of B.

The press has a top plate, I, and a bottom plate, J, which, at the sametime, is the bot tom plate of the clamp. These two plates containbetween them the other parts of the clamp, and are pressed together byfour or any suitable number of screw-bolts, K, provided with heads L andnuts L.

The top plate, I, of the press is provided with four tubes, M, passingup through the apertures ff in the plate F, and through which tubes thescrew-bolts pass, and have their nuts resting upon the upper edge ofthese tubes. The plate I is also provided with'a standard, N, whichpasses through the slot G in F, and has a small right-angled projection,n, fitting into the notch h in H.

The bottom plate, J, is provided with a cavity, O, which forms part ofthe clamp, into which the plaster mold and the celluloid are placed, andwith four holes, j j j, having ridges l l 1 onto sides to prevent thebolt-heads from turning. A ring-shaped plate, P, provided withperforated ears pp and with recessed projections p p, rests upon J. Aplate, Q, provided with projections r r on its under side, rests upon Pand is covered by I. The projections r 'r are to prevent this lid Q fromsliding ofi" of the opening in P. The feathers or guides O 0 pass intothe recesses z t' in I, p'p in P, and s s in J, and prevent the clampand press from turning. Two screws, R It, pass through the screw-holes tt iIhJ and into the screw-holes in the ears 1; p of P, and hold P and Jtogether independently of the other parts of the press.

The apparatus operates as follows: The moist plaster molds and thecelluloid plates are placed into the clamp, the parts P and J are unitedby the screws R, and thelid Q is placed on top of the clamp. Thescrew-heads then rest on thebottom E of B. The press top plate, I, withthe tubes M M and the top F, are united, as shownin Fig. 1, and passedinto the chamber B, so that feathers 0 pass into the recesses in thedifferent parts. The chamber B with contents is then placed into thebase A, and the latter is placed onto an ordinary stove or onto the hotcoals.' By the action of the heat the celluloid will begin to swell andcamphor is liberated, which is carried off by the current of air passingup I will begin to drop, and as soon as the projection n rests in thenotch h the screw-bolts must be drawn up tight.

The base A retains the heat for a long time, and as it gets warmgradually the plates are not in danger of being damaged by a suddeneffect of the heat.

As soon as the base is molded the press is taken out of the chamber 13,the nuts are loosened, the bolts are drawn out, and the clamp consistingof the parts P and J can be removed from the press, can be laid asidefor cooling, and a fresh clamp can be placed into the press as long asthe parts are warm, thus As the parts P and J are united saving heat. bythe screws R R, the molded base cannot warp when the clamp is removedfrom the press, but is firmly held between the plaster mold until it iscold. The apparatus works so rapidly that the plates are molded beforethe" plaster molds are dry.

If celluloid is placed between moist plaster molds, it is not damaged byheat.

I am aware that it is not new to use a chamber surrounded by a conicalsheet'metal jacket but What I claim as new and of my invention is 1. Thecombination of the base A with the cylindrical chamber B, provided withfeathers O G on the sides, and the slots E Ein the bottom, substantiallyas herein shown and described, andfor the purpose set forth.

'2. The combination of the top plate, F, provided with a slot, G, andvertical projection H, with the top press-plate, I, provided with astandard, N, and bolt-tubes M M, substantially as herein shown anddescribed, andfor the purpose set forth.

3. The combination of the bottom clampplate, J,Wthe intermediate part,P, and the press-plate I, and the tubes M M, with the screws K K,substautially'as shown and described, and for tlie'p'urpose set forth.

4. The combination of the cham'ber B, provided with the feathers O (J,with the plate I, having recesses i i, the part1, having recesses 19 p,and the bottom plate, J, having recesses s s, substantially as hereinshown and'described, and for'the purpose set forth.

LEMUEL DAVISDOBBINS. Witnesses:

ALFRED W. CLEMENT, AARON ELLIs.

